Analysis and improvement of protection action of flexible DC transmission system based on dynamic resistance characteristics of DC circuit breaker’s transfer branch
Protection Technology in AC/DC Hybrid Power Grid|更新时间:2026-06-30
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Analysis and improvement of protection action of flexible DC transmission system based on dynamic resistance characteristics of DC circuit breaker’s transfer branch
Electric Power Automation EquipmentVol. 39, Issue 9, Pages: 46-53(2019)
ZHAO Guankun,JIA Ke,WANG Congbo,et al.Analysis and improvement of protection action of flexible DC transmission system based on dynamic resistance characteristics of DC circuit breaker’s transfer branch[J].Electric Power Automation Equipment,2019,39(09):46-53.
ZHAO Guankun,JIA Ke,WANG Congbo,et al.Analysis and improvement of protection action of flexible DC transmission system based on dynamic resistance characteristics of DC circuit breaker’s transfer branch[J].Electric Power Automation Equipment,2019,39(09):46-53.DOI: 10.16081/j.epae.201909013.
Analysis and improvement of protection action of flexible DC transmission system based on dynamic resistance characteristics of DC circuit breaker’s transfer branch
When the DC circuit breaker clears the fault current through the commutation between its branches,the fault transient electrical quantity of the system will change. The influence of DC circuit breaker’s action characteristics is not considered in the principle design of existing DC protection,which may cause the misoperation of the existing DC protection. Therefore for flexible HVDC(High Voltage Direct Current) system,the action characteristic of DC circuit breaker during DC short circuit fault is analyzed,the short circuit current analytical expression considering quench characteristics of fault current in each flow branch of DC circuit breaker is given,the applicability of existing current differential protection,low voltage over-current protection and differential protection is verified,and then a protection algorithm based on the current integral value is proposed,which solves the misoperation problems of the current differential protection with strong ability to resist the transition resistance and noise. Finally,a ±320 kV double-terminal flexible DC transmission system model is established by PSCAD/EMTDC electromagnetic transient simulation software. The simulative results verify the correctness of theoretical analysis and the applicability of the proposed protection algorithm.
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